Honouring Uncle David.

My grandmother passed away last year. When she was alive she often spoke about her brother David Redfern who was a fisherman. He was 20 when he was Lost at Sea when his fishing boat 'St Romanus' went down in the 60s. He sailed out of the Port of Hull (Kingston Upon Hull). We used to go to the docks to cast flowers out to sea to remember him each year, and still do now to remember them both.

I plan to use Marilla meaning 'Shining Sea' for a girls name, probably in the middle, to honour this heritage and my Grandmother. Her name was Isobel but everyone called her Ella.

I'd like to honour David in someway, but without using the name David, because I have another family member called David and everyone would think it was to honour him.

I think of Meryl /Merrill/ Merle, the name of an elderly relative in my family. According to my Bruce Lansky baby name book, it can mean "shining sea."
And for a fishing reference, I think of St. Andrew, the Biblical disciple of Christ. He and SimonPeter were fishermen by trade. I like that Andrew, Simon, and Peter are all traditional names like David.How about just Roman, as a simpler form of Romanus?

I like the suggestion of Roman, it sort of streamlines Romanus a bit and is probably less likely to get teased.Kai is quite popular on here, and apparently means 'sea'.
You could go with another name which means 'beloved' as David does, perhaps.